Malicious PDF — malware analysis report

Static analysis result for SHA-256 342eeadb77ba4c04…

MALICIOUS

PDF

94.5 KB Created: 2021-09-08 20:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43522ace36a470892fc5ffb001f21cbe SHA-1: ec413f44197ecdde214a2ee3573255a424f10f12 SHA-256: 342eeadb77ba4c049e83f4aa15b968b54fc4d1a013f0ba5f4d77f1fb2955e0e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to distribute links across many low-reputation hosts. No scripts were extracted, but the overall structure and URL distribution point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://acril.ru/ufiles/files/19861082243.pdf In PDF document text
    • http://bumsnab.ru/uploads/files/52209215431.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/mivomefiwovubonosifap.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131a87f260f9---xulid.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/pexatexabiludulefoli.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/2172853985.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/89544393281.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/27526298822.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/wubet.pdfIn PDF document text
    • https://lorus.rs/files/78500965403.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/xaberu.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/67447855345.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/tajisupamobedinebabexaru.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/wemomuxovifowawofoxo.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/gulazure.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1dd2c0975c1b5ef016804ac985716ccb/19880789546.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/negonakivuxi.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/fixojobifono.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/21199213033.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///fulos.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/bukevaxil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=faceless+full+book+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 19052 bytes
SHA-256: 73c8ffcd7c4359a5c4eb5e60f661d814277d546ebfbb92402d5ba52e8f167add
font_01_sfnt_off00013c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7B 10528 bytes
SHA-256: 8861d58a20476a42d24dae809384f30cf26c3e7a48ee3cd5b09b5c81693d4ca0
font_02_sfnt_off00015460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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